/ Dictionary / Index S sulfurous acid: Meaning and Definition of Find definitions for: sul'furous ac'id Pronunciation: [key] — Chem. Chem. a colorless liquid, HSO, having a suffocating odor, obtained by dissolving sulfur dioxide in water, known mainly by its salts, which are sulfites: used chiefly in organic synthesis and as a bleach. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sulfurous sulfur polypore Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language